Did they retain the amphibious capability of the parent M113? Granted, you may not have had much opportunity to find out at Hood.
But in the early 1970s I ran across a batch of the things with the missiles off and front splashboard removed. Had it just been one vehicle, or two, I'd have just figured it was dry rot of the splashboard plywood, but there were 8 or 9 so arranged. And I don't recall whether or not they still had the sideskirts over the tracks installed or not, pretty necessary if any swimming is to be done.
-archy-/-